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Design method of pre-posed diffuser controlled based on total pressure loss

A technology of total pressure loss and design method, which is applied in the direction of combustion method, combustion equipment, lighting and heating equipment, etc., to achieve high flow performance, clear design ideas and good engineering practicability

Active Publication Date: 2015-05-06
XIAMEN UNIV
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  • Description
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  • Application Information

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Problems solved by technology

The currently published invention patents focus on the design of the structure of the sudden expansion diffuser, but there are few patents on the design method of the general sudden expansion diffuser that

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  • Design method of pre-posed diffuser controlled based on total pressure loss
  • Design method of pre-posed diffuser controlled based on total pressure loss
  • Design method of pre-posed diffuser controlled based on total pressure loss

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Embodiment Construction

[0023] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings, that is, the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0024] The present invention comprises the following steps:

[0025] 1) Determine the original size. Such as figure 1 As shown, the prediffuser inlet size H is determined according to the compressor outlet size 0 , determine the length L of the prediffuser according to the overall design length requirements of the gas turbine 0 , in subsequent designs H 0 and L 0 constant;

[0026] 2) Determine the critical expansion angle θ 0 . According to multiple sets of calculation and experimental comparison data, the present invention proposes the critical sudden expansion angle θ 0 The prediction formula ① is where C P is the static pressure recovery coefficient, H 0 is the inlet si...

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Abstract

The invention discloses a design method of a pre-posed diffuser controlled based on total pressure loss and relates to an aircraft gas turbine. The design method of the pre-posed diffuser is simple and effective, and the performances of different-structure design schemes can be quickly and reliably estimated in the early design phase of the pre-posed diffuser, thereby obviously reducing the design cost and improving the design reliability. The inlet size H0 of the pre-posed diffuser is determined according to the outlet size of a gas compressor; the length L0 of the gas compressor is determined according to the design length of the whole gas turbine; H0 and L0 retain unchanged in follow-up design; a critical divergence angle theta0 is determined according to the relational expression of the static pressure recover coefficient CP and the divergence angle theta in the diffuser; according to the critical divergence angle theta0, the critical value Hr of the outlet height H at the pre-posed section of the diffuser is determined based on the geometrical relationship, and geometric parameters at the pre-posed section of the diffuser are totally determined.

Description

technical field [0001] The invention relates to an aviation gas turbine, in particular to a design method of a pre-diffuser based on total pressure loss control. Background technique [0002] An aviation gas turbine is mainly composed of an inlet, a compressor, a combustion chamber, a turbine, and a nozzle. After the air enters the gas turbine from the inlet, it is first pressurized by the compressor into high-speed and high-pressure gas, and the outlet speed of the compressor can reach 120-300m / s. If it is difficult to ignite successfully, in order to organize stable and reliable combustion, it is generally required to decelerate to 40-60m / s before the cyclone. The purpose of deceleration can be achieved by installing a diffuser between the compressor outlet and the combustion chamber inlet. From the perspective of energy conservation, in the process of fluid deceleration and diffusion, the total pressure loss of the diffuser is required to be as small as possible, otherwi...

Claims

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Application Information

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IPC IPC(8): F02C7/04F23R3/10
Inventor 黄玥阮灿邢菲徐磊磊
Owner XIAMEN UNIV
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